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Ensign was the lowest rank of a commissioned officer. Ensigns often served as support staff for senior personnel, performing duties such as engineer's assistant, security officer, or nurse. However, some ensigns received postings on the bridge as fully-fledged senior staff.

In one extraordinary circumstance, Ensign Jason Fredricks was forced to take command of the USS Leviathan when the position fell to him following the death or capture of all other senior bridge staff by Klingons.[1]